Mc Alpine Basin space saver with self-closing waste valve is made of polypropylene (PP) and includes 1¼" x 1¼" BSP x compression connections. It is designed to allow full use of storage space below the basin within the cabinet or furniture. The internal membrane opens under water pressure to allow discharge to flow freely and then closes to form a seal to prevent foul odour or sewer gas entering the building. The valve allows air to be drawn into the discharge waste pipe when negative pressures

Brand Name	McAlpine